NHibernate-ORM

NHibernate is an Object/Relational Mapping (ORM) framework for the .NET platform. It provides a way of mapping .NET classes to database tables, and a simple API for querying and manipulating data.

Features

• Supports multiple database providers, including Microsoft SQL Server, Oracle, MySQL, PostgreSQL, SQLite, and more.
• Provides a powerful and flexible querying API, including support for complex joins, subqueries, and aggregate functions.
• Supports both XML and code-based mapping configurations.
• Provides caching functionality to improve performance.
• Supports transactions, including distributed transactions across multiple databases.
• Provides a second-level cache for improved performance in read-heavy scenarios.
• Supports lazy loading for better memory management.
• Supports automatic generation of database schema from .NET classes.
• Supports optimistic locking for concurrency control.

Getting started

To use NHibernate in your .NET project, you'll need to follow a few steps:

1. Add the NHibernate NuGet package to your project.
2. Configure NHibernate by creating a SessionFactory object, which represents a connection to your database.
3. Create a mapping file or configure mapping in code to define the relationships between your .NET classes and database tables.
4. Use the SessionFactory to open a session, which represents a transaction with the database.
5. Use the session to query or manipulate data.

Here's some example code to get you started:

using NHibernate;
using NHibernate.Cfg;
using NHibernate.Mapping.ByCode;

// Step 1: Add the NHibernate NuGet package to your project.

// Step 2: Create a SessionFactory object to represent a connection to your database.
var configuration = new Configuration();
configuration.Configure();
var mapper = new ModelMapper();
// Configure mapping in code or use XML mapping files.
// Here's an example of code-based configuration:
mapper.AddMapping<UserMap>();
configuration.AddMapping(mapper.CompileMappingForAllExplicitlyAddedEntities());

var sessionFactory = configuration.BuildSessionFactory();

// Step 4: Open a session to the database.
using (var session = sessionFactory.OpenSession())
{
    // Step 5: Use the session to query or manipulate data.
    var users = session.Query<User>().ToList();
    // ...
}

Conclusion

NHibernate is a powerful and flexible ORM framework for the .NET platform. It provides a wide range of features to help you map .NET classes to database tables, query and manipulate data, and improve performance. If you're looking for an ORM framework for your .NET project, NHibernate is definitely worth considering.